Distinctiveness: the impression is attributed to the thing if it uniquely occurs when the thing is present and does not occur in its absence. 2. Consistency over time: each time the thing is present, the individual's reactions must be the same or nearly so. 3. Consistency over modality: his reaction must be consistent even though his mode of interaction with the thing varies. 4. Consensus: attributes of external origin are experienced the same way by all observers.
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Robert B. Settle (1972) studied this question.
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